Home / 12,178.40-18,266.85-7,499.30

Finding the Fourth Proportional to 12,178.40, 18,266.85 and 7,499.30

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Solution

The fourth proportional to 12,178.40, 18,266.85 and 7,499.30 is: 11,248.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,178.40 : 18,266.85 = 7,499.30 : x
  2. Step 2: Convert to fraction form
    12,178.40/18,266.85 = 7,499.30/x
  3. Step 3: Cross multiply
    12,178.40x = 18,266.85 × 7,499.30
  4. Step 4: Simplify right side
    12,178.40x = 136,988,588.21
  5. Step 5: Solve for x
    x = 136,988,588.21/12,178.40
  6. Step 6: Final answer
    x = 11,248.49

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.